heckel and his sister alisha tell bit. ever since that completely normal morning in 1991, when their mom, katherine dolan heckel kissed him goodbye, left for work and never returned. law do you remember leaving that morning? >> yeah. i mean, like any other day. same routine all the time, every time she left us, she kissed us goodbye. >> it was a july morning, alisha, 13 and john, then nine, we're home for summer vacation. election i name, alicia says your mom calls from her job. >> we discussed having dinner and having pork chops. >> that was one of my favorite things she cooked. >> later, they tried to contact their mom at work. >> one of the times we tried to call her, it was around lunchtime, and she had left for lunch. then, we waited in called after lunch, and she still wasn't back to work. >> at 40, kathy heckle head spin laugh for life working at the paper plant in lock haven. >> i can't remember who i was speaking to at the office, but you could hear in their voice that there was some concern, that she hadn't come back. >> and you pick that up? >> yeah. it was not typical for her to not come back, and not tell any